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Abstract #2878

Short-term Fourier Transform Analysis of Respiratory- and Cardiac-driven Pulsation of Cerebrospinal Fluid under Free Breathing

Tetsuya Tokushima1, Satoshi Yatsushiro2, Saeko Sunohara1, Mitsunori Matsumae3, Hideki Atsumi3, and Kagayaki Kuroda1,2

1Cource of Electrical and Electric Engineering, Guraduate School of Engineering, Tokai University, Hiratsuka, Kanagawa, Japan, 2Guraduate School of Information Science and Technology, Tokai University, Hiratsuka, Kanagawa, Japan, 3Department of Neurosurgery, Tokai University, Isehara, Kanagawa, Japan

To separate the respiratory- and cardiac-driven motions of cerebrospinal fluid (CSF) under free breathing, CSF velocity in 7 healthy volunteers and 3 hydrocephalus patients were observed by asynchronous phase contrast (PC) technique with monitoring respiratory and ECG signals. Spectrograms of CSF velocity and respiratory signal obtained by short-term Fourier transform (STFT) with 8-sec length Hamming window revealed that the peak respiratory motion appeared in 0-0.5 Hz band, while the cardiac motion appeared around 1-1.5 Hz. These results suggest that the separation of the two motion components is possible by sliding the frequency bands temporarily according to the spectrogram.

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